/*
 * Copyright 2018 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.kie.workbench.common.dmn.client.commands.expressions.types.dtable;

import java.util.Optional;

import org.kie.workbench.common.dmn.api.definition.model.DecisionTable;
import org.kie.workbench.common.dmn.api.definition.model.HitPolicy;
import org.kie.workbench.common.dmn.client.commands.VetoExecutionCommand;
import org.kie.workbench.common.dmn.client.commands.VetoUndoCommand;
import org.kie.workbench.common.stunner.core.client.canvas.AbstractCanvasHandler;
import org.kie.workbench.common.stunner.core.client.canvas.command.AbstractCanvasCommand;
import org.kie.workbench.common.stunner.core.client.canvas.command.AbstractCanvasGraphCommand;
import org.kie.workbench.common.stunner.core.client.command.CanvasCommandResultBuilder;
import org.kie.workbench.common.stunner.core.client.command.CanvasViolation;
import org.kie.workbench.common.stunner.core.command.Command;
import org.kie.workbench.common.stunner.core.command.CommandResult;
import org.kie.workbench.common.stunner.core.graph.command.GraphCommandExecutionContext;
import org.kie.workbench.common.stunner.core.graph.command.GraphCommandResultBuilder;
import org.kie.workbench.common.stunner.core.graph.command.impl.AbstractGraphCommand;
import org.kie.workbench.common.stunner.core.rule.RuleViolation;

public class SetHitPolicyCommand extends AbstractCanvasGraphCommand implements VetoExecutionCommand,
                                                                               VetoUndoCommand {

    private final DecisionTable dtable;
    private final HitPolicy hitPolicy;
    private final org.uberfire.mvp.Command canvasOperation;

    private final Optional<HitPolicy> oldHitPolicy;

    public SetHitPolicyCommand(final DecisionTable dtable,
                               final HitPolicy hitPolicy,
                               final org.uberfire.mvp.Command canvasOperation) {
        this.dtable = dtable;
        this.hitPolicy = hitPolicy;
        this.canvasOperation = canvasOperation;

        this.oldHitPolicy = Optional.ofNullable(dtable.getHitPolicy());
    }

    @Override
    protected Command<GraphCommandExecutionContext, RuleViolation> newGraphCommand(final AbstractCanvasHandler handler) {
        return new AbstractGraphCommand() {
            @Override
            protected CommandResult<RuleViolation> check(final GraphCommandExecutionContext gce) {
                return GraphCommandResultBuilder.SUCCESS;
            }

            @Override
            public CommandResult<RuleViolation> execute(final GraphCommandExecutionContext gce) {
                dtable.setHitPolicy(hitPolicy);

                return GraphCommandResultBuilder.SUCCESS;
            }

            @Override
            public CommandResult<RuleViolation> undo(final GraphCommandExecutionContext gce) {
                dtable.setHitPolicy(oldHitPolicy.orElse(HitPolicy.UNIQUE));

                return GraphCommandResultBuilder.SUCCESS;
            }
        };
    }

    @Override
    protected Command<AbstractCanvasHandler, CanvasViolation> newCanvasCommand(final AbstractCanvasHandler handler) {
        return new AbstractCanvasCommand() {
            @Override
            public CommandResult<CanvasViolation> execute(final AbstractCanvasHandler handler) {
                canvasOperation.execute();

                return CanvasCommandResultBuilder.SUCCESS;
            }

            @Override
            public CommandResult<CanvasViolation> undo(final AbstractCanvasHandler handler) {
                canvasOperation.execute();

                return CanvasCommandResultBuilder.SUCCESS;
            }
        };
    }
}
